IDEC SmartRelay functions
4.4 Special functions list - SF
IDEC SmartRelay Manual
176
• Retentive on-delay (Page 140) (current time Ta)
• Interval time-delay relay/Pulse output (Page 142) (current time Ta)
• Edge-triggered interval time-delay relay (Page 144) (current time Ta)
• Asynchronous pulse generator (Page 146) (current time Ta)
• Stairwell light switch (Page 150) (current time Ta)
• Dual-function switch (Page 152) (current time Ta)
• Stopwatch (Page 166) (actual value AQ)
• Frequency trigger (Page 175) (actual value Fre)
Select the required function by the block number.
Timing diagram
Functional description
The frequency trigger measures the signals at input Fre. The pulses are recorded across a
configurable time G_T.
Output Q is set and reset in accordance with the set thresholds. See the calculation rule
below.
Calculation rule
• If the On threshold ≥ Off threshold, then Q = 1, if f
a
> On or Q = 0, if f
a
≤ Off.
• If the On threshold < Off threshold, then Q = 1 if On ≤ f
a
< Off.
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